Utilization of lignin separated from pre-hydrolysis liquor via horseradish peroxidase modification as an adsorbent for methylene blue removal from aqueous solution

• Published in: Industrial crops and products Vol. 167; p. 113535
• Main Authors: Liu, Qin, Wang, Fusheng, Zhou, Hao, Li, Zongquan, Fu, Yingjuan, Qin, Menghua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2021
• Subjects: Adsorption; HRP; Lignin modification; Methylene blue; PHL; Adsorption; PHL; Lignin modification; HRP; Methylene blue
• ISSN: 0926-6690; 1872-633X
• DOI: 10.1016/j.indcrop.2021.113535

[Display omitted] •Lignin recovery from PHL and adsorbent preparation was achieved in one step.•The lignin was modified and recovered from PHL via HRP treatment.•Lignin recovered from PHL by HRP treatment was a good adsorbent for MB removal.•The maximum MB adsorption capacity of EML was 241.1 mg/g at 308 K. The lignin in PHL could be modified and recovered from pre-hydrolysis liquor (PHL) by horseradish peroxidase (HRP) treatment. The enzyme-modified lignin (EML) separated from PHL was used to adsorb and remove methylene blue (MB) from a model dye effluent; the adsorption performance of EML was studied. The results indicated the carboxyl content of the lignin in PHL increased by HRP treatment, and the EML removed from PHL had a carboxyl content of 0.69 mmol/g and a BET surface area of 25.6 m2/g. With the increase of pH, the adsorption capacity of EML obviously increased. The maximum MB adsorption capacity of EML was 210.2 mg/g and 241.1 mg/g at 298 K and 308 K, respectively. The fitting results revealed that the equilibrium adsorption isotherms and adsorption kinetics followed the Langmuir model and pseudo-second-order model, respectively.